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After the test chambers, Portal changes from 'tech demo' to 'game' for me. Absolutely great in every way, from atmosphere to gameplay elements, to story developement.
Too bad the game's so short, I really, REALLY enjoyed it :(

Also, GLaD0S is a great character and has some of the best character developement in just about 5 hours time I've ever seen.
The boss battle is done really good, and proves combat with only the Portal gun is possible.

I love to see Portal's sequel to be a full game, instead of a 5-hour quasi tech demo.